The PS2 version was one of the best selling Dragon Quests, IIRC, at least overseas, thanks in part to the Final Fantasy XII demo it came with. Also, plenty of people can get it for $20 on their mobile phones and Tablets (albeit with severe framerate problems that I'm not aware if they fixed) for $20, and many more people have those devices than 3DS games. "Missing out" is not the excuse here. If you "missed out" it's readily available. You could even still get the game new on amazon for $10 as late as 2012, and while the price has been steadily going up, it's not super expensive yet, and there are still plenty of PS2 consoles...that's not the concern here. Unless they put in some more new content (and quite frankly, they probably shouldn't, the game was pretty much perfect when it was released, and "new content" by Square-Enix terms almost always means "unfairly tedious and hard bonus dungeons with B-list excuses for a bonus plot"), I think it would be fair to call the new game milking it. S-E just following tradition. Personally, I'd be tempted to just skip it (I haven't actually finished the PS2 version, anyways, and at the rate I progress through DQ games, the game probably will be remade again by the time I finish it), and wait for DQ9's remake, which I think could use a revamp, at least for some in-game adjustments and online/streetpass stuff.
If you want it for the 3DS and don't mind the graphical downgrade, fine (unless you have a readily available PS2, in which case, what is wrong with you?!). But seriously, the original was very impressive to look at, and even Dragon Quest IX couldn't surpass it in scope. I mean, it had plenty of pop-in already, but it just felt like a big world that was fully explorable, and for a series that pretty much established the "grand adventure" that JRPGs always sold themselves as, I think that's a pretty important aspect. I wouldn't downplay that change, even if you haven't played it before.
Exactly. This version hasn't sold itself as one that's worth getting over the PS2 version yet, and right now, its seeming more like its making a case against it. Especially since you already have two different versions that are available and one of those is on a console flush with RPGs of pretty much every walk of genre.
And all of this is moot anyways if this version doesn't get localized to begin with (which would be fucking sad because not only is DQ Heroes 1 getting localized (which shares a few of the main VAs from the original localization), but the translation work has already been done and just needs to be reinserted and then distributed/marketed (and if distributed digitally, that's even less of a reason why it wouldn't come over)).
Also, yeah. The bonus stuff that the various DQ remakes have gotten over the years have varied somewhere between gamebreaking (having a fourth party member slot in DQV) to pointless (DQIV's 'Sixth' Chapter). Its kind of a crapshoot.
Also also, DQIX doesn't need a revamp so much as it needs a full on remake. It had so many issues that even making the DLC stuff available/less bullshit, you still have that pitifully short main quest (DQIII is probably a longer game) and the grindtacular 'post game' content.